反应详情

温度

50 °C

2.72 g of 7-aminocephalosporanic acid was suspended in 16 ml of water and 8 ml of acetone, and a suspension of 2.1 g of sodium bicarbonate in 16 ml of water was dropwise added thereto over a period of 7 minutes time. The inside temperature of a reactor was then increased to 50° C., and a suspension of 2.3 g of 6-mercaptotetrazolo[4,5-b]pyridazine in 35 ml of acetone was added dropwise thereto over a period of time of 10 minutes. The resulting mixture was refluxed for 6 hours at a stable inside temperature of reactor of 61° C. followed by allowing the refluxed mixture to stand. The pH of the solution was 8 and thereafter, the mixture was adjusted to a pH of 3.6 with 6 N hydrochloric acid under ice cooling, in which the pH was measured by means of a pH meter and then stirred for 1 hour. The precipitated crystals were filtered and dried over phosphorus pentoxide under reduced pressure to obtain 2.39 g of the titled compound having a melting point (decomposition) of 202° to 205° C.

1. additionwas dropwise added
2. additionwas added dropwise
3. waitover a period of time of 10 minutes
4. temperatureThe resulting mixture was refluxed for 6 hours at a stable inside temperature of reactor of 61° C.
5. filtrationThe precipitated crystals were filtered
6. dry with materialdried over phosphorus pentoxide under reduced pressure